What happens if my external drive is not connected?
 

If I have scheduled a backup to run while my MacBook is sleeping (or when it's on too), will I be presented with a prompt when it wakes up informing me that the destination drive was not available? SilverKeeper has this feature, but as it doesn't work with my new intel MacBook Pro I"m not looking for a new backup app. Thanks, Martin

Not during a scheduled backup, no: scheduled backups are designed to run unattended, so prompts like this are suppressed. But SD! will remain open so you can see that something went wrong.

ok, thanks